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Vs code also don't advertise what language it's for, isn't the same case here?

On VS Code's front page it explicitly lists 12 languages and that it "supports almost every major programming language. Several ship in the box, like JavaScript, TypeScript, CSS, and HTML, but extensions for others can be found in the VS Code Marketplace."

They support every language through their plugin architecture.

"Cursor works with any programming language. We’ve explicitely worked to improve the performance of our custom models — Tab included — on important but less popular languages like Rust, C++, and CUDA."

Hundreds of languages supported: https://code.visualstudio.com/docs/languages/overview

You should be good as long as you use one of the mainstream languages: Python, JS, Java, C++, Golang, Ruby, Rust etc

Elixir has noticeably improved with recent releases